CN112649336B - Humidity interference removal method - Google Patents

Humidity interference removal method Download PDF

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CN112649336B
CN112649336B CN202011480773.6A CN202011480773A CN112649336B CN 112649336 B CN112649336 B CN 112649336B CN 202011480773 A CN202011480773 A CN 202011480773A CN 112649336 B CN112649336 B CN 112649336B
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value
humidity
air
absolute humidity
outdoor
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CN112649336A (en
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罗武文
敖小强
金陈祎
冯倩
李四寿
王玮
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Beijing SDL Technology Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/06—Investigating concentration of particle suspensions
    • G01N15/0606—Investigating concentration of particle suspensions by collecting particles on a support
    • G01N15/0618—Investigating concentration of particle suspensions by collecting particles on a support of the filter type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/06—Investigating concentration of particle suspensions
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/06—Investigating concentration of particle suspensions
    • G01N2015/0681—Purposely modifying particles, e.g. humidifying for growing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

This patent belongs to atmospheric particulates monitoring technical field. The book is provided withThe patent provides a method for removing humidity interference, which comprises the following steps: when e Outdoor unit >e Reference(s) At time C Correction ＝C Measuring ‑Δ e wet *M Correction The method comprises the steps of carrying out a first treatment on the surface of the When e Outdoor unit <e Reference(s) At time C Correction ＝C Measuring +Δ e wet *M Correction The method comprises the steps of carrying out a first treatment on the surface of the Wherein e Outdoor unit Is the absolute humidity value of the outdoor environment, e Reference(s) Is the reference absolute humidity value, delta e wet Is the humidity difference between the absolute humidity value of the outdoor environment and the reference absolute humidity value, C Measuring Is the instrument for measuring the humidity value, C Correction Is to correct the measured humidity value, M Correction Indicating a corrected water absorption value. The method improves the monitoring accuracy of the particle monitor by the ray method.

Description

Humidity interference removal method
Technical Field
This patent belongs to atmospheric particulates monitoring technical field.
Background
The current common monitoring methods for atmospheric particulates are: manual weighing, beta-ray absorption, and oscillating microbalance. The principle of the beta-ray absorption method is that after beta-rays pass through a substance to be measured, the intensity attenuation degree of the beta-rays is only related to the mass of the penetrated substance, and is not related to the physical and chemical properties of the penetrated substance. The beta-ray absorption method has the advantages that the required sample quantity is small, one monitoring data can be automatically obtained per hour, the change condition of the concentration of the particulate matters in the air can be reflected in real time, the data transmission can be carried out, the remote monitoring and the automatic control are facilitated, and the manual workload is greatly reduced. Therefore, the beta-ray method has become one of the main measurement methods of continuous automatic monitors of the concentration of particulate matters in the atmosphere. When comparing the results of the automatic monitoring, the manually used filters were measured after equilibration for 24 hours in a constant temperature and humidity cabinet at 25 ℃ and 50% relative humidity. While the on-line monitoring instrument of the automatic method cannot ensure that the sampled filter belt is kept under the same condition.
In the monitoring process, the humidity of the sample gas can have an important influence on the filter paper belt and the attached particulate matters, and particularly, when the absolute humidity of the outdoor air is larger than that of manual sampling balance, the water vapor absorbed by the filter paper belt and the particulate matters attached to the filter paper belt is larger than that of the water vapor in balance, so that the measurement result is larger and deviates from the actual situation. When the absolute humidity of the outdoor air is lower than that of manual sampling balance, the water vapor absorbed by the filter paper tape and the particles attached to the filter paper tape is larger than that in the balance, so that the measurement result is smaller and deviates from the actual situation. This effect is particularly pronounced in high temperature and high humidity climates, and in the winter season of northern cold drying.
Disclosure of Invention
The patent provides a method for removing humidity interference, which comprises the following steps:
when e Outdoor unit >e Reference(s) At time C Correction ＝C Measuring -Δ e wet *M；
When e Outdoor unit <e Reference(s) At time C Correction ＝C Measuring +Δ e wet *M；
Wherein e Outdoor unit Is the absolute humidity value of the outdoor environment, e Reference(s) Is the reference absolute humidity value, delta e wet Is the humidity difference between the absolute humidity value of the outdoor environment and the reference absolute humidity value, C Measuring Is the instrument for measuring the humidity value, C Correction Is a corrected measured humidity value, M represents a basic water absorption value, m=5×10 -8 。
Further, the calculated absolute humidity value of air is the absolute humidity of air under the conditions that the air pressure is 1013.25hPa, the air temperature is 25 ℃ and the relative humidity is 50 percent: e, e Reference(s) ＝e 25 saturation ×50％＝11.55(g/m 3 )。
Further, each sampling period is 1 hour or is set according to the requirement of the monitoring condition.
Further, the calculating the absolute air humidity value of each sampling period is to calculate the air humidity value of the outdoor air under the current air temperature, air pressure and relative humidity according to the measured outdoor temperature, humidity and air pressure parameters, and the calculating formula is as follows: e, e Outdoor unit ＝e Saturation ×RH％(g/m 3 )。
The method improves the monitoring accuracy of the beta-ray method particle monitor.
Detailed Description
Example 1
Absolute humidity: at a certain temperature, the actual content of water vapor in the sample air is called absolute humidity.
Saturated humidity: at a certain temperature, the maximum value of the water vapor which can be contained in the sample air (when the maximum value exceeds this value, dew condensation occurs, and water drops appear on the wall), which is called saturation humidity.
The purpose of this patent is to solve the problem that the measured value that current beta ray method particulate matter monitoring instrument exists under different humidity climatic environment and manual weighing numerical deviation, provides a humidity interference removal method based on algorithm, includes following step:
1. calculating the absolute humidity e of air Reference(s) A value;
the absolute humidity value of the calculated air is under the conditions of 1 standard atmospheric pressure (1013.25 hPa), the air temperature is 25 ℃ and 50% relative humidity, and the calculation formula is as follows: e, e Reference(s) ＝e 25 saturation ×50％＝11.55(g/m 3 )；
Wherein e Reference(s) Is the absolute humidity value of air, e 25 saturation The air pressure was 1 standard atmospheric pressure (1013.25 hPa) and the air temperature was 25℃at saturation humidity. The specific value can be obtained by inquiring a saturated humidity table.
2. Calculating the absolute humidity e of the outdoor environment for each sampling period Outdoor unit A value;
each sampling period is 1 hour or is set according to the requirement of monitoring conditions;
the air absolute humidity value of each sampling period is calculated according to the measured outdoor temperature, humidity and air pressure parameters, and the air humidity value of the outdoor air under the current air temperature, air pressure and relative humidity conditions is calculated according to the calculation formula: e, e Outdoor unit ＝ e Saturation ×RH％(g/m 3 )；
Wherein e Outdoor unit Is the absolute humidity value of the outdoor environment, e Saturation Refers to outdoor temperature stripSaturated absolute humidity under the part; RH% is a relative air humidity measurement; the saturated steam pressure (E) is the steam pressure at which the steam reaches saturation. The saturated water vapor pressure has a direct relation with the temperature. As the temperature increases, the saturated water vapor pressure increases significantly.
Wherein e Saturation ＝217*p Saturated water vapor pressure T; wherein p is Saturated water vapor pressure The unit is hPa for the saturated water vapor pressure at the test temperature; t is the test temperature, and the unit is K;
in the (-30- +30) deg.C range, the saturated water vapor pressure simplified formula is;
Figure BDA0002837491080000031
t is the test degree centigrade;
the more generalized calculation formula is: when the degree celsius t tested is greater than 0 degrees: p is p Saturated water vapor pressure ＝e Surface of water ＝ 6.11×10 7.5t /237.3+t The method comprises the steps of carrying out a first treatment on the surface of the When the degree celsius t tested is less than 0 degrees: p is p Saturated water vapor pressure ＝e Ice surface ＝6.11×10 9.5t/265.5+t 。
3. Calculating a corrected water absorption value; m is M Correction ＝n×M Basic, basic Wherein M is Basic, basic ＝5×10 -8 μg/m 3 ；
n is the value obtained by dividing the measurement result of the particle monitor by 10; according to the data obtained by manual reference, setting the water absorption rate of the particulate matters to be increased by taking 10ug as a step;
when the measurement result of the monitor is more than 0 mug and less than 5 mug, n=0, namely no correction is made;
when the measurement result of the monitor is 5 mug or more and less than 10 mug, n=0.5, namely 0.5 basic times of water absorption rate is 2.5×10 -8 ；
When the measurement result of the monitor is more than or equal to 10 mug and less than 20 mug, n=1, namely 1 times of basic water absorption rate and 5×10 -8 ，
When the measurement result of the monitor is 20 mug or more and less than 30 mug, the water absorption is 2 times of the basic water absorption, n=2, namely 2 times of the basic water absorption, 1×10 -7 ，
And the water absorption multiplying power value n is obtained by dividing the measurement result of the particle monitor by 10.
4、Δ e wet ＝|e Outdoor unit -e Reference(s) |；
Wherein e Outdoor unit Is the absolute humidity value of the outdoor environment, e Reference(s) Is the absolute humidity value of air, delta e wet Is the humidity difference between the absolute humidity value of the outdoor environment and the reference absolute humidity value.
5. Correcting the measurement result of the instrument; when e Outdoor unit ＞e Reference(s) At time C Correction ＝C Measuring -Δ e wet *M Correction Units: mu g/m 3 The method comprises the steps of carrying out a first treatment on the surface of the When e Outdoor unit ＜e Reference(s) At time C Correction ＝C Measuring +Δ e wet *M Correction Units: mu g/m 3 。
Wherein e Outdoor unit Is the absolute humidity value of the outdoor environment, e Reference(s) Is the absolute humidity value of air, delta e wet Is the humidity difference between the absolute humidity value of the outdoor environment and the reference absolute humidity value, C Measuring Is the instrument for measuring the humidity value, C Correction Is to correct the measured humidity value, M Correction Indicating a corrected water absorption value.
The method of the patent realizes that the monitoring result of the automatic monitoring instrument is consistent with the condition of the manual weighing method of 25 ℃ and 50% of relative humidity, and improves the final monitoring accuracy of the radial particle monitor.
Comparative example 1
Measuring instrument: an automated instrument MODEL 2230 ambient air particulate monitor.
Manual weighing method: manual filter membrane sampler and constant temperature and humidity weighing system.
In winter in Beijing, the data before the inventive method was not used are as follows:
the data linear fit results were:
y＝0.91x+1.6
R 2 ＝0.99
Figure BDA0002837491080000041
the data corrected after the application of the inventive patented method are as follows:
the data linear fit results were:
y＝0.99x+0.44
R 2 ＝0.99
sequence number Manual weighing value Measured value of MODEL 2230 after humidity compensation
1 117.10 116.8
2 13.19 13.5
3 11.19 11.6
4 33.95 33.6
5 89.71 88.9
6 108.96 107.7
7 90.54 89.3
8 8.75 9.9
9 8.29 8.4
10 12.40 12.7
11 17.67 17.78
The slope is increased from 0.91 to 0.99 by 8.7%, which is nearly identical to the manual weighing data.

Claims (1)

1. A method for humidity interference removal, comprising the steps of:
when e Outdoor unit >e Reference(s) At time C Correction =C Measuring -
Figure QLYQS_1
*/>
Figure QLYQS_2
;
When e Outdoor unit <e Reference(s) At time C Correction =C Measuring +
Figure QLYQS_3
*/>
Figure QLYQS_4
;
Wherein e Outdoor unit Is the absolute humidity value of the outdoor environment, e Reference(s) Is the value of the reference absolute humidity,
Figure QLYQS_5
is the humidity difference between the absolute humidity value of the outdoor environment and the reference absolute humidity value, C Measuring Is the measured value of the particle monitor, C Correction Is to correct the particle monitor measurement, +.>
Figure QLYQS_6
Indicating a corrected water absorption value;
the corrected water absorption rate value
Figure QLYQS_7
Wherein->
Figure QLYQS_8
Figure QLYQS_9
N is the water absorption rate value, and is the value obtained by dividing the measurement result of the particulate matter monitor by 10;
the reference absolute humidity value e Reference(s) The calculation conditions of (2) are as follows: absolute humidity of air at an air pressure of 1013.25hPa, an air temperature of 25 ℃, 50% relative humidity:
Figure QLYQS_10
Figure QLYQS_11
=11.55 g/m 3 ；
the said
Figure QLYQS_12
The air pressure is 1 standard atmospheric pressure, and the air temperature is 25 ℃ saturated humidity;
absolute humidity value e of the outdoor environment Outdoor unit Is the value of each sampling period;
each sampling period is 1 hour or is set according to the requirement of monitoring conditions;
Figure QLYQS_13
，p saturated water vapor pressure The unit is hPa for the saturated water vapor pressure at the test temperature; t is the test temperature, and the unit is K;
the air absolute humidity value of each sampling period is calculated according to the measured outdoor temperature, humidity and air pressure parameters, and the air humidity value of the outdoor air under the current air temperature, air pressure and relative humidity conditions is calculated according to the calculation formula:
Figure QLYQS_14
g/m 3 the method comprises the steps of carrying out a first treatment on the surface of the Wherein->
Figure QLYQS_15
Is the absolute humidity value of the outdoor environment, +.>
Figure QLYQS_16
Refers to the saturated absolute humidity under outdoor temperature conditions; />
Figure QLYQS_17
Is a relative air humidity measurement. />
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